Is there a right amount of fragmentation? Or is monolithic control like Windows and MacOS better? Part of the promise of open source software is that it can be

Is there a right amount of fragmentation? Or is monolithic control like Windows and MacOS better? Part of the promise of open source software is that it can be adapted and extended. Part of the promise of Linux is that the kernel and the DE are not completely dependent on each other. So it can hardly be surprising when people take these promises at face value and make things with them.